Bad in itself as a PC game and a smartphone OS have NOTHING in common. It's like trying to attach a motorcycle panel on a jumbo jet cockpit and expecting the pilots to make do because "it performs well on motorbikes". Everything has a place and an ultra-small touch screen UI should never ever inspire anyone to make a big screen UI with mouse. There's a gigantic reason why Windows 8 utterly failed and is loathed universally and it's the same reason Skyrim UI blows. That's trying to fit irrelevant aspects in the wrong place just because it's the hip thing to do and makes boatloads of money for an irrelevant company for irrelevant products.
Aesthetically it's rather bad, tons and tons of text that's not appealing in the very least and there's no UI whatsoever except a crowded compass, it's way too minimalistic so you need to deal with ugly menu after menu to see stuff that should have been on your screen to see at a glance like debuffs. The only part they did aesthetically right is the skills menu. I don't know about anyone else but bland walls of white text reminds me DOS, not a modern game. The stuff I used to get away from as soon as possible to launch a game 25 years ago.
FO3/NV UI even though far better, still weren't that good. Stupid console-assigned hard buttons that kept burdening for every loot inventory etc, again with the tons of text that also was a nightmare to browse through, way too much scrolling. They really should blow up the usable area of the screen and add item icons that's been industry standard for decades and was last used back in Oblivion. Yeah I can read and comprehend but why do I need to? Just show a big [censored] icon, brains work faster that way. There's a reason WHOLE computer UI business is using icons for decades.